obj = Object.new
def obj.+(other_obj)
	"Trying to add something to me, eh?"
end 
puts obj + 100

class Account
	attr_accessor :balance
	def initialize(amount=0)
		self.balance = amount
	end 
	
	def +(x)
		self.balance += x
	end 
	def -(x)
		self.balance -= x
	end 
	
	def to_s 
		balance.to_s
	end 
end 
acc = Account.new(20)
acc -= 5
puts acc 